stephens



R. C. STEPHENS. LTGHTTNG'HXTURE. APPLICATION FILED OCT. Il. 1915.

Patented July 15, 1919.

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LIGHTING FIXTURE.

APPLICATION FILED ocT.|l.191:

WW und .l 7G N2 0h. .0,n rp. Mn W5 MM 3 um IMM Z imi'rE Asra'rns ramener 'onirica e ROBERT o. STEPHENS, or ST. LOUIS, MISSOURI.

- v LIGHTING-FIXTURE.

Specification of Letters Patent. Patented July 15, 1919.

Application iled October/11, 1915. Serial No. 55,191.

' exact description, .reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to lighting fixtures adapted to receive high powered incandescent lamps of the bowl or globe type usedat the present time for street and other lighting by electricity.

Many ofthe fixtures heretofore employed become inj-uriously hot, and diiiicult to handle, the insulation of the wires being lamp very rapidly. The advantages of such v 'have usually been designed to receive a frequently burned or impaired and the life of the lamp shortened. I One of the ob'ects of my invention is to produce a fixture adapted to use high powf ered lamps, without becoming extremely hot and without transmitting a high degree of vheat to the wiresleading to the lamp. .I

attain this objectby a new Structure in which the heated air is conducted from the a fixture will be apparent tothose skilled in the art.

The value offhigh powered incandescent lamps is -of course due to their high efficiency, but their Omaximum eiiiciency is Vnot attained except when the lamp is located in a predetermined position with' respect'to the lamp-receiving bowl or globe, and to insure the desired efficiency, prior fixtures particular lamp and bowl or globe. The efficiency of such a fixture is materially decreased by changes in the relative sizes of lamps and bowls or globes. Owingto the lack of interchangeability, the useof such fixtures is 'limited to the combination of .certain bowls or globes and lamps, and

while some designed changeability has been attempted, no decided change has been made without affecting the efficiency of the fixture. An object of my invention is to produce a fixture adapted to receive many different kinds of lamps, lamp sockets and bowls or globes, and which is so constructed that the maximum efficiency can be obtained by adjusting the lamp or lamp Socket to a predetermined position with respect to the With the foregoing andother objects in view Vthe invention comprises the novel construction, combination and arrangement of parts herelnafter more specifically described and illustrated in the accompanying draw-V `describing a particular shape of inclosure,

as either term is commonly used to describe the same article, owing to the state of the art.` 1 v Figure I is a side elevation, partly in section, illustrating a fixture embodying the features of my invention. f

Fig. II is a detail view of the adjustable device which supports the lamp.

Fig. lIII is a fragmentary detail view showing one of the bayonet joints for Securing the bowl-supporting ring.

'Fig IV is an enlarged horizontal section taken approximately on the line IIT-IV, Fig. I, i

Fig. V is a fragmentary horizontal sec- -tion taken approximately on the line V-V,

ing a seat for the outer .marginal portion of the ventilator ring E, and the bowl or globe F is secured to the'ventilator ring by means of screws 2. The ventilator ring has a seriesy of openings 3 for the admission of air to the interior 'of the dome. The supporting ring D, constituting a support for the ventilator ring E, which supports the bowl or globe F, is provided with a series of bayonet slots 4 l(Figs. I -and III) veach having a recess 5 at its inner end. The

Vdome is provided with supporting pins 6' adapted to lie in the recess 5 to secure the ring D. The supporting ringD is positively prevented from turning by means of is provided with an inturned flange 1 forming screws 7 are adjusted to withdraw their inner ends from the bayonet slots; the sup` porting ring D is then turned and moved downwardly to release it from the supporting pins 6.

When the parts are assembled, the Ventilator ring E, which supports the bowl or globe is firmly secured to the supportingring D by means of a series of adjustable clips 8 arranged ina plane above the ventilator ring supporting ring -D to prevent the ring E from moving upwardly; each clip having a vertical slot 9 for the reception of a screw 10, the latter being screwed into the supporting ring D. Before applying the supporting ring D to the dome C, the retaining clips are adjusted to properly engage the ventilator ring E and are then locked by the screws 10, thus firmly securing the bowl F and ventilator ring E. to the supporting ring D.

12 designates an incandescent electric lamp, arranged within the bowl or dglobe F and fitted to a socket 13, the latter having an extension 13 screwed onto the 'lower end of a" sleeve K. The upper end of'k the sleeve K is screwed into domefC. AThe sleeve K, through the extension 13, constitutes an adjustable supportl for the socket 13 and lamp 12, and may be rotated to adjust the vertical position of the lamp with respect to the bowl or globe F. As previously stated, the maximum lighting efficiency is obtained by locating the lamp in a predetermined position with res ect to the bowl or globe lF, and to insure t is efficiency, lighting fixtures have been constructed to hold a predetermined size of amp and bowl or globe in fixed relative ositions. Hence,l the efficiency of the prior devices may be greatly reduced by substi` tuting one lamp for another, ,or by the use of a bowl or globe not adapted to coperate with the lamp for which the fixture-was designed. My improved lighting xture is adapted to receive lamps and bowls or globes of various different styles and dimensions; and the maximum lighting efficiency can be obtained by rotating the supporting sleeve K to vertically adjust the lamp to a point where it will coperate with the bowl or globe to produce the desired lighting effect.

To aid the operator in the determination of the exact position of the lamp, the threaded upper portion of the sleeve K (Figs. 1 and 11) is provided with aseries of E and adjustably secured to the the upper portion of the ing screw 16. The xture is particularly incombinations of lamps and bowls or globes, and when itis to be used with one of the predetermined combinations, the supporting sleeve K will be adjusted to locate one of its depressions 15 at a point opposite the screw 16. Cbviously, the parts may thus be easily and accurately adjusted to the predetermined positions, to insure the maximum lighting efficiency, irrespective of the dimensins or shape of the lamp and bowl or g be.'

To prevent the fixture from becoming extremely hot when subjected to the action of a large incandescent lamp, the flaring dome C is provided with a series of upwardly extending radiating fins 17 forming passageways for defiecting air currents along the outer face of the dome and tion thereof. The heat generated .by the lamp, is transmitted through the dome, to the radiating fins 17 which assist in removing heat from the outer face of the dome. The temperature of the dome is reduced by transmitting some of its heat to the radiating fins 17 ,and also by the air currents which are guided along the outer face of the dome by the radiating fins. Webs 17', forming upwardly extending continuations of some ofthe fins 1 7, are formed integrallyl with a securing member 20 and a Ventilating/ ring 21 surrounding the web-s 17 and spaced from the flaring dome C and fins 17 so that the upper portion of the dome is open, as shown in Fig. l, that air Currents flowing upwardly along the radiating fins 17, will passytended to receive certain frequently used through the Ventilating ring 21 into the hood depressions 15 for`the reception of a lockin service the dome is V becoming extremely hot, and without transmitting a high degree of heat to the insulation of' the wires (not shown). The wires may be inserted through the tubular hanger A, or through openings 23 in the ventilat infr ring 21.

To prevent the transmission of heat from the dome C to the hanger A, the dome C and hood B are insulated from each other by a suitable non-conductor of heat 24 as asbestos. rlhis insulating material lies between and is fitted to the hood B and dome C, said parts being fastened -together by screws 25.

1. ln a lighting fixture, the combination of a lampereceiving globe, and a dome above said globe; said dome being provided with a series of radiating fins and having at its up per end al ventilat-lng ring spaced from the main body of the dome, Some of said radiating fins serving to connect said ring and dome.

2. In a lighting fixture, the combination of a lamp-receiving globe, a dome above said globe. and a hood above said dome; said dome being provided with a series of radiating fins and including a ventilating ring connected 'to the body of the globe by some of said fins, said Ventilating ringbeing spaced from the body of said dome to provide air passageways leading to said hood.

3. In a lighting fix-ture, a lamp-receiving globe, a dome above said globe, said dome being provided with a series of radiating fins for conducting heat from its body portion and said radiating fins being arranged to form passageways for deflecting air currents along the outer face of said dome and to the upper portion thereof, the upper portion of said dome having an opening which communicates with its interior and also with the passageways formed by said radiating fins, and a hood above said opening.

4.-. In a lighting fixture, a lamp-receiving globe, a dome above said globe, said4 dome being provided with a Series of radiating fins forming passageways for defiecting air currents along the outer face of the dome and to the upper portion thereof, the upper portion ot said dome being 1n open com- 'munication with said passage-ways and also with 'the interior of the dome, a ventilating ring being formed around the upper portion of said dome. and a hood above said dome adapted to receive the air flowing from the upper portion of the dome.

In a lighting ixture, a lamp-receiving globe. a flaring dome above said globe, a lamp support at the upper end of said dome and an opening being formedv between said lamp support and lthe side wall of said dome, a Ventilating ring surrounding-Said opening, the outer face of said dome being provided with a series of radiating fins forming passageways for the deflect-ing air currents to a point Within said Ventilating ring, and a hood above said dome.

G. In a. lighting fixture, a dome, a lampreceiving globe, a ventilator ring surrounding said globe at a point near the lower portion of the dome, said ventilator ring having openings for the admission ot' air to the interior of said dome, the outer face of said dome being provided with radiating fins forming passagewa-ys for conducting air to the upper portion of the dome, the upper portion of' said dome being open to permit the discharge of air from the interior of the dome.

7. In a lighting fixture, a lamp-receiving globe. a ,supporting ring forming a seat for the upper portion of Said globe, said supporting ring being provided with bayonet slots, a support-ing device including pins arranged in said bayonet slots, and means for locking said supporting ring to prevent it from turning independently of said supporting device, said means including pins adjustably secured Vto the support-ing device and adapted to extend into said bayonet slots.

S. In a lighting fixture, the combination of a dome, a supporting ring detachably secured 'to said dome, and having an inturned flange, a ventilator ring seated on said flange, and a lamp-receiving globe vsecured to said ventilator ring.

9. In a lighting fixture the combination of a supporting device having an inturned flange, a globe-supporting member seated on the flange, and a vertically adjustable stop secured to the body of the supporting device and adapted to control the movement of the globe-supporting member.

10. In a lighting fixture the combination of a, supporting device having aninturned flange, a globe-supporting member seated on the flange, and a vertically adjustable stop, comprising a retaining clip'and a tightening screw passing through the-clip into the supporting device.

ROBERT C. STEPHENS. 

